document.getelementbyid("service").style.top = 150 + "px";
window.onscroll=function()
{
	var scrolltop = window.pageyoffset || document.documentelement.scrolltop || document.body.scrolltop || 0;
	document.getelementbyid("service").style.top = scrolltop + 150 + "px";
}
function close_service()
{
	document.getelementbyid("service").innerhtml = "";
	document.getelementbyid("service").style.width = "0px";
	document.getelementbyid("service").style.height = "0px";
}
//乘风